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Old 06-11-2013, 12:07 PM   #16
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Spray foam pros and cons


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Originally Posted by Windows on Wash View Post
Check the warranties. Certainteed allows for insulated roof decks and spray foam.
Certainteed is the only manufacturer that does not void the warranty if there is no ventilation, and only for their fiberglass shingles. I've read the warranties for Iko, BP, CRC, GAF... they all void the warranty if there is inadequate ventilation.

Of course, these are all only material warranties, which has their own purpose, but people hear the term "warranty" and assume too much. A lot of the issues are workmanship issues, which is a whole different warranty.

Spray foam is an excellent product but I think in the residential market it is being used in a lot of improper situations without regard to best practices. It is treated as a silver bullet and as a cover up for a lot of bad design or construction.

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Old 06-12-2013, 07:15 AM   #17
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Spray foam pros and cons


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Originally Posted by mj12 View Post
After reading this I am confused. I thought baffles were required when spray foaming the underside of a roof. After reading this post I have come to two conclusions. Before I insulate I am going to run the whole job past you guys. Next, I will probably just go with the fiberglass batts because I know what to expect with the fiberglass. I have found that baffles are needed in cold northern climates even with fiberglass batts. I insulated a cathedral ceiling that was Not vented and had mold after one winter. I made my own baffles from ridge board and put new insulation up. I guess every situation is a little different. I am still hoping oil will go to 15 dollars a barrel and we can just go back to not using insulation
There are a ton of resources out there on spray foam and if you consult some the Building Science.com articles, you will learn everything that you would ever want to know about SPF.

Don't settle on an inferior insulation just because you don't understand SPF. That being said, you don't necessarily need SPF if you take a well thought out approach to using other insulation materials in combination. A combination of rigid board and batt (I still wouldn't use fiberglass though) can work just as good as SPF.

Good luck on the energy price. We will be talking about this in 10 years and it will be $185 a barrel.


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Originally Posted by shazapple View Post
Certainteed is the only manufacturer that does not void the warranty if there is no ventilation, and only for their fiberglass shingles. I've read the warranties for Iko, BP, CRC, GAF... they all void the warranty if there is inadequate ventilation.

Of course, these are all only material warranties, which has their own purpose, but people hear the term "warranty" and assume too much. A lot of the issues are workmanship issues, which is a whole different warranty.

Spray foam is an excellent product but I think in the residential market it is being used in a lot of improper situations without regard to best practices. It is treated as a silver bullet and as a cover up for a lot of bad design or construction.
Not sure I would even use any other shingles to start with but you are right that they are behind the times.

I think you can talk to some of them and they will issues an exception or at least they have to prove the material failure is the result of the lack of ventilation.

I agree with you 100% of SPF. There is more of it being put in wrong than there is right.

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